IMMOBILISER SYSTEM(w/o Entry and Start System), Diagnostic DTC:B2784

DTC Code DTC Name
B2784 Antenna Coil Open / Short

DESCRIPTION

When an open or short circuit is detected in the antenna coil built into the transponder key coil, the transponder key ECU assembly stores this DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B2784

Antenna Coil Open / Short

The antenna coil in the transponder key coil is open/shorted.

  • Harness or connector

  • Transponder key coil

  • Transponder key ECU assembly

  • DTC Output Confirmation Operation:

  • Insert the key into the ignition key cylinder.
Table 1. Vehicle Condition and Fail-safe Operation when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Operation when Malfunction Detected

Engine cannot be started

-
Table 2. Related Data List and Active Test

DTC No.

Data List and Active Test

B2784

Antenna Coil Status

WIRING DIAGRAM

B329324E12

CAUTION / NOTICE / HINT

Note:

  • If the transponder key ECU assembly is replaced, refer to the Service Bulletin.

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

  • When using the GTS with the vehicle ignition switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Immobiliser. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

PROCEDURE

  1. CLEAR DTC

    1. Clear the DTCs.

      Click hereClick here

      Body Electrical > Immobiliser > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  2. CHECK FOR DTC

    1. Check for DTCs.

      Click hereClick here

      Body Electrical > Immobiliser > Trouble Codes

      Tip:

      Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

    Result

    Proceed to

    B2784 is not output

    B2784 is output
    B2784 is not output

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick hereClick hereClick hereClick here

    B2784 is output

  3. CHECK CONNECTION OF CONNECTOR

    1. Check that the connectors are properly connected to the transponder key coil.

    Result

    Proceed to

    NEXT
    NEXT

  4. CLEAR DTC

    1. Clear the DTCs.

      Click hereClick here

      Body Electrical > Immobiliser > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  5. CHECK FOR DTC

    1. Check for DTCs.

      Click hereClick here

      Body Electrical > Immobiliser > Trouble Codes

      Tip:

      Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

    Result

    Proceed to

    B2784 is not output

    B2784 is output
    B2784 is not output

    END (CONNECTOR WAS NOT CONNECTED PROPERLY)

    B2784 is output

  6. CHECK TRANSPONDER KEY COIL (OUTPUT)

    1. Using an oscilloscope, check the waveform.

      B329326C07

      *a

      Component with harness connected

      (Transponder Key Coil)

      *b

      Waveform 1

      *c

      Waveform 2

      -

      -
      Table 3. Waveform 1

      Item

      Content

      Tester Connection

      G6-1 (ANT1) ←→ Body ground

      Tool Setting

      2 V/DIV., 500 ms/DIV

      Condition

      Within 3 seconds of inserting key into ignition key cylinder
      Table 4. Waveform 2

      Item

      Content

      Tester Connection

      G6-5 (ANT2) ←→ Body ground

      Tool Setting

      2 V/DIV., 500 ms/DIV

      Tool Setting

      Within 3 seconds of inserting key into ignition key cylinder

      OK

      Waveform is similar to that shown in the illustration.

    Result

    Proceed to

    OK

    NG
    NG

    CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY COIL)Click here

    OK

  7. REPLACE TRANSPONDER KEY ECU ASSEMBLY

    1. Replace the transponder key ECU assembly with a new one.

      Tip:

      Refer to the Service Bulletin.

      Note:

      Key ID code registration is necessary when replacing the transponder key ECU assembly.

      Refer to the Service Bulletin.

    Result

    Proceed to

    NEXT
    NEXT

  8. CLEAR DTC

    1. Clear the DTCs.

      Click hereClick here

      Body Electrical > Immobiliser > Clear DTCs

    Result

    Proceed to

    NEXT
    NEXT

  9. CHECK FOR DTC

    1. Check for DTCs.

      Click hereClick here

      Body Electrical > Immobiliser > Trouble Codes

      Tip:

      Before checking for DTCs, perform the "DTC Output Confirmation Operation" procedure.

    Result

    Proceed to

    B2784 is not output

    B2784 is output
    B2784 is not output

    END (TRANSPONDER KEY ECU ASSEMBLY WAS DEFECTIVE)

    B2784 is output

    REPLACE TRANSPONDER KEY COIL

    Click here

  10. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU ASSEMBLY - TRANSPONDER KEY COIL)

    1. Disconnect the G88 transponder key ECU assembly connector.

    2. Disconnect the G6 transponder key coil connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G88-4 (ANT1) - G6-1 (ANT1)

      Always

      Below 1 Ω

      G88-15 (ANT2) - G6-5 (ANT2)

      Always

      Below 1 Ω

      G88-4 (ANT1) - Body ground

      Always

      10 kΩ or higher

      G6-1 (ANT1) - Body ground

      Always

      10 kΩ or higher

      G88-15 (ANT2) - Body ground

      Always

      10 kΩ or higher

      G6-5 (ANT2) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE TRANSPONDER KEY ECU ASSEMBLYClick here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR